#include <iostream>
using namespace std;
class base
{
public:
    int a;
    base(int a=0){
        this->a=a;
    }
};
class son: public base
{
public:
    int a;
    son(int a=0){
        this->a=a;
    }
};
int main()
{
    base f(100);
    son z(200);
    cout<<z.a<<endl;
    cout<<z.base::a<<endl;
    return 0;
}